The World Leader in High Performance Signal Processing Solutions

Introducing ADuM3190/4190 Linear Isolators

Based on iCoupler® Digital Isolator Technology

February 2013

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ADuM3190/4190: Industry’s First Integrated, Isolated Linear Error Amplifiers

Ideal for cost-sensitive primary side control power supplies striving for the performance of secondary side control

Replaces optocouplers and shunt regulators by using iCoupler isolation technology Reduces cost by up to 25% Reduces size by up to 25% Saves power consumption by up to 65% Increases performance with 10x wider

bandwidth Extends usability with operating temperature

up to 125°C Improves reliability with standard, foundry

CMOS

Existing Primary Side Controllers Use Optocouplers and Shunt Regulators

Limit Performance (Bandwidth & Transient Response) 25 kHz maximum loop bandwidth limits

transient response

Consume Excess Power 100mW loss from LED – 20mA at 5V More current improves performance but

hurts efficiency

Use Multiple ICs and Consume Area Slow switching speed requires large size of

Lout and Cout

Limit Operating Temperature Typical limit is 85°C

Pose Reliability Challenges CTR uncertainty requires over

compensation – slowing down the loop

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ADuM3190/4190 Replaces These

Components

ADuM3190/4190 iCoupler Alternative Improves Primary Side Control Solutions

Increases Performance (Bandwidth & Transient Response) 250 kHz bandwidth (10x wider) improves

transient response

Saves Power Only 35mW vs. 100mW for optocouplers No need to increase power to improve

performance

Reduces Components and Area Consumes 25% less board space Integrates regulator

Extends Operating Temperature Range Qualified for 125°C operation

Improves Reliability No CTR uncertainty to contend with

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4 mm

5 mm

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ADuM3190/4190 Features and Specifications

Specifications Total Accuracy

1% TMIN to TMAX

-40C to 125C TA

-3dB bandwidth 400kHz Wide Voltage Range

VDD1 and VDD2 - 3V to 20V

Features Voltage or Current Output 1.225V Reference DOSA compatible Integrator or DC Gain UVLO

ADuM3190 2.5kV rms Isolation Rating ADuM4190 5kV rms Isolation Rating

For Use as an Isolated Error Amplifier for Power Supply Feedback

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Designers No Longer Have To Choose Between Primary & Secondary Side Control

Optocoupler SolutionChoose Between

Performance and Cost

OR

HighPerformance

LowCost

Secondary SideControl

Primary SideControl

Primary Side Controlwith ADuM3190/4190

ADuM3190/4190 enables fast transient response performance of secondary side control with the low cost of primary side control

ADuM3190/4190Achieve Both

Performance and Cost

HighPerformance

ANDLowCost

Application Example:Analog Primary-side Control

Isolated Error Amplifier with the Same Functionality and Better Performance

than Traditional Optocoupler and Shunt Regulator Solutions

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VOSC

Op Amp with 10MHz Gain BW

enables high switching

frequency of DC/DC converter

Reference 1% stability over

temperature and time for high

accuracy DC/DC output

Output BW 400kHz for fast loop response

PWMController

Supports VOUT from 1V to 48V

Compliant to DOSA Trim Standard

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+ lVref

1.225V

ADuM3190

VOUTDOSA Module

Rtrim-up

Rtrim-down

Error Amp

Rset1

Rset2

R3

R4

Module nominal output R3 R4 R5 R6

VOUT > 1.5V 1k 1k 0 ∞

VOUT < 1.5V 1k 0 2.05k 1.96k

VOUT > 1.5V 5.11k 5.11k 0 ∞

VOUT < 1.5V 5.11k 0 10.5k 10.0k

VIN= 0.35 to 1.5VOptional trim up or trim down resistor by +/-10% of nominal value according to DOSA

ADuM3190/4190 DOSA Compliant Configuration

R5

R6

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Application Example:Isolated Voltage Feedback for Digital Controllers

DigitalController

ADC

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ADuM3190/4190 vs. Optocoupler Solution

Optocoupler Shunt Regulator Solution

ADuM3190/4190 Solution

Max Bandwidth 25 kHz 400 kHz

Accuracy (Maximum @ 125°C TA) Not Guaranteed 1%

Max Current Consumption 20mA 7mA

Number of ICs 2 1

Operating Ambient Temperature Range -40 to +85°C -40 to +125°C

CTR Degradation with time, temperature and current 75% No CTR!

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ADuM3190 / ADuM4190 Options

ADuM3190ARQZ

ADuM3190BRQZ

ADuM3190SRQZ

ADUM3190TRQZ

ADuM4190ARIZ

ADuM4190BRIZ

ADuM4190SRIZ

ADuM4190TRIZ

Isolation Rating Max. Ambient Temp. Typical Bandwidth

2.5 kV rms 5 kV rms 85°C 125°C 200 kHz 400 kHz

$1.04

$1.12

$1.14

$1.23

$1.20

$1.28

$1.30

$1.39

1K resaleUSD

Evaluation Board also available: EVAL-ADUM3190EBZ - $49USD

Supports the function of ADuM3190 and ADuM4190

Learn More About iCoupler Digital Isolatorswww.analog.com/iCoupler

Resources Include: Webcast and Training videos Interface and Isolation Newsletter Archives and Subscription Link Circuits from the Lab™ Application Notes Technical Articles Digital Isolator Product Selector Guide Regulatory Agency Certifications Datasheets Evaluation Boards

And Much More!